Index for machine tools



L'SSJB .3mm @EL D. c. KLAUSMEYER INDEX FOR MACHINE TOOLS Original Filed May 5i7 1925 O H Z I4 QUT Posx'rloN Fon HAND FEED 53m/@amica www Patented Janr,v `1931- y PATENT o1=1=1c1=.:v

DAVID e. KLAUSMEYER, or CINCINNATI, oIIIo, AssIGNoRfTo THE CINCINNATI BICI:- Fonn Toor. COMPANY, oFoAKLEY, CINCINNATI, oHIo, A CoRPoRATIoN oF OHIO INDnxIon MACHINE Toons Original application-'med May 5V, 1925,

' ,I Various machine tools are adapted to perform a plurality of unlike toolingA operations each of which may require a dierent rate of tool speed or feed. A drilling and tapping machine is a good example of a machine tool` kof this nature.' WVhen this typefof machine l1s used for-drilling the tool spindle is rotated In modern'drilling machines as lmany as vthirty-six spindle-speeds are provided and as many as twentyfour changes are'provided for rthe axial feed of the spindle. When drilling is to be performedthe most efficient speed of rotationand rate of feed-are determined 'bythe size of thedrill to be used', and the nature of the workto be drilled but the machinewill,nevertheless, operateat vatween the 'speed and feed,

riations ofthev most'ecient rates and therefore accurate coordmatlon 1s not essential be- In tapping, however, the speed of rotation `and the axial feed of the spindle must beac-y 'curately"coordinated, inasmuch as holes are For example, the standard thread for a onef inch'hole is `eightthreads per inch and the standard/thread for a' 2% inch hole is four threads perinch. Thus in the first instance,

the axial feed of the tap must -be approximately 125 inch per rotation, whereas in the ,last instance it must be aboutv .250 inch per rotation. Very slight variations may be com- ',pensated lfor by a slightfloat in 'the tap 'holderi 1 The variations in drilling feeds are necessarily more numerousthan the variations required for tapping'and therefore only a small vproportion of the available-feeds are used as tapfe'eds, tok wit;-those` which correspond with the lead of standard taps.

f To render available the required number and rates offeed, drilling and tapping machines y aref usually provided with speed change Vvmechanisms which may be actuatedA Serial No. 28,214. Divided and this application led January 15 1927. seriaiNo.1s1,413.

by a'Inanually shiftable lever or levers) and an index isffrequently providedy which co- Voperates with the lever: (or levers) to assist the operatorin selecting the desired feed. It 1s important,r especially in tapping, that the lever'be positioned accurately toprovide the' feed corresponding to the lead of the tap to be used;` .Itlhas been found, however, that where vthe index'plate is all of the samegen-v .eral appearance and only the indicia thereon 1s different it becomes somewhat -tof a maze to the operator and he will sometimesl inadvertently effect an undesired setting of the lever, and thereby the speed change devices,

withV the result that the spindle will not bel fed at the intended and requiredrate. It

will readily be perceived that when this occurs in tapping the rotation and feed of the spindle willfnotbe coordinatedwith the lead of the thread on the tap and something must break, Thisinventionuhas for an object to render available an improved index for ma' Chinetools whichvbetter will assist the operator in eecting the desired setting of the speed change mechanisms and which will Y tend to'rpreclude dangerous errors in such settings by eliminating the maze-effect of the index vand directing his attention especially to those settings which are vital for certain operations. v

This object-has been attained by the provision of an index for machine tools in which certain portions thereof are of a color in contrast with the color of adjacent portions whereby the operators. attention will, by ,a casual observance of' the index, be attracted to those particular Vportions and he more easily may effect the proper setting of the controll lever and with less likelihood of error.V .Other objectsand advantages .will be in part indicated in the following description and in part rendered apparent therefrom in connection with the annexed drawings.

"To enable others skilled in the art so fully to apprehend the underlying features hereof that'theygmay embody thesame in the vari-r ous ways contemplated by this invention, drawings depicting a preferred typical construction have been annexed as a part of this disclosure, s f

transverse section on the line ofFig. 2,

also 'showing' the cooperation'of the-index Y with the control lever.

'This application is a divisioaof my pena- .I ing application Serial No. 28,2114 filed May `5.,

, tionary framework.

1925, to Which reference maybe had for de-E tails ofthe feed change mechanism adapted to be actuated by `the Acontrol lever tofgive a tool spindle axial'feedat varying rates. f For the purpose of this application it will sufiiceA to say that all of the changes are effected by Y transverse movementsof ahaiid lever 1, fulcrumed at 2 to a yoke 3, projecting laterally from a sleeve 4, rot-atablyjournaled'i'n a sta- VVSplined Within the sleeve Aitis a change gear control shaft 5`provided with a rack 6, permanently in mesh with a segment 7 on the lever 1. The change -gearmechanisms are so constructed and arranged that rotation of the shaft 45, by horizontal movement of the haiidflever land sleeve L1,Will effect eight speed changes, and Vaxial movement' thereof -by vertical movenient of the hand lever yvill multiply'those eight speeds by three thus renderingavailable, for selective use, twenty four speed changes.

` To enable the operator readilyto select any one of the twenty-four available feeds I have provided an improved index which Vmay be supported adjacent the controllever and which is adapted to cooperate with a pointer 8 carried thereby. This index comprises three horizontall royvs '.Q/ and e' of indicia corresponding to the three vertical positions of the hand lever. Y Each of these three Vrows is divided into eight subdivisions corresponding to the eight horizontal positions of theV hand lever. The eight effect horizontal positions of the hand lever 1 are indicated by dot-dash lines a, b, 0, d, e, f, g and It, in Fig. 3 andthe three effective vertical positions Vthereof arie shown at 1X and 1y and 1z in Fig. 2.

it will kreadily be perceived that inasmuch as the lever l may be-.given universal movements the 'pointer-f8' readily may be moved adjacent any one of the subdivisions. on the index. Y The index may bey applied to the ma- Vchine in yany desired Way but preferably it `will be placed `upon a plate 9 which may beV 4'secured to la stationary part of the machine.

The twenty-four subdivisions of the index are each provided with suitable markings to indi-cate theresults obtained by shifting the pointer' tio any one :of these' subdivisions.

When the index is used in connection lwith.

spindle feed mechanism. as above described this indicia Ymay represent feeds in thousandths of an inch per rotation of the spindle.

. VAs hereinbefore stated, these machine tools are used'both for drilling-and tapping and in lorder to tap a hole with a` standard thread Vit is necessary that only a certain predetermined feed be employed. For example, inasmuch as the standard screw thread for a oneinch holeiseight threads per inch iti-s necessary, Vwhen tapping a hole of that diameter,

that the tap be advanced one-eighth of an kinch (or .12er-inch)V for each rotationthereof. In that case the'leve'r 1 Wouldbe shifted to bring the tip of the pointer 8 into registry- With the subdivisions? Whic'hys Vmarked 125F indicating a feed fof .A125 inch per rotation of the tool spindle.

Tovenable the operator readily and Without calculationV to shiftthe gears to produce anyavailable standard tap lead, those subdivisions which Yproduce Vspindle feeds, corresponding to the various'standard tap leads,

falso contain indicia vto indicate that fact.V vForinstance, the subdivisions al also con` d tains the marking .8T which indicates that when the pointer 'is brought to that subdivision the gears `Will be so meshed as to tap eight threads per inch. f Y y Y Still further to assist the operator in selecting'the setting which produces the standard tap leads the subdivisions Which indicate such settings are'preferablyof acolorin contrast with the color of the subdivisions which do -not indicate a standard tap leadv and Which are used primarily for drilling feeds. For.

example, the subdivisions 21, e2, z3, z, z5, s, y1, and .the instruction Ysubdivision o may have a background of black andthe remainder of lthe subdivisions and the blank.,

'w may have a background of red, but any other contrasting colors may be used. For convenience, the tap feed subdivisions are shown in black and the drill feed subdivisions shown in White, but :it is to beunderf stoodthat these colors are only representa- Y tive. Itis also to be understood that this in- Vention also contemplates making the subdivisions of contrasting appearance other than by coloring.

' Although this invention has been shown anddescribed in connection with lthe tool feed of a drilling and tapping machine and the particular Vindex illustrated is specific to those operations,` it is perceived that this .multi-colored index may be used to advantage in variousother types of machine tools. It is therefore intended that Vthe 'claims` shall be construed to cover all such uses, in lInachine tools, for which the improved indexV is adaptable. f

It will readily be perceived that, although simple 1in' construction, an index of this nature will .y eatly assist the operator in :securing the.. es-ired :adjustment and ^will :mate-- 'llO rially reduce breakage which heretofore `has resulted from improper settings of the'change gear control lever. Having thus revealed this invention, I 5 claimas new and desire to secure the following combinations and elements, o-r equivalents thereof, by Letters-Patent of the United States zl. An index for drilling and tapping mam chines comprising a field dividedinto subdivisions; indicia in Lcerta-in ones of said subdivisions designating tool feeds suitable for drilling andlindicia in others of said subdivisions designating tool feeds suitable Vfor 1r tapping; the subdivisions designating the rfeeds for one ofsaid operations -being of a colo-r in contrast with the color `to the subdivisions designating the feeds for the other operation. i Y n y 20 2. An Aindex for drilling Yand tapping machines comprising a plurality of 'subdivisions; a single indicia mark, representing tool feeds in thousandths of an inch per rotation of the tool in certain ones of said sub- 25 divisions; and other indicia marks representing standard tap feeds in threads per inch in others of said subdivisions. Y o 3. An index for drilling and tapping machines comprising a plurality7 of subdivisions; indicia in each of said subdivisions` representing drilling feeds yin thousandths per rotation of a drill; additional indicia in certain ones of said subdivisions representing feeds substantially corresponding to the lead n of a standard tap, the subdivision containing Y the tap feeds indicia being of eontrastin appearance with respect to the subdivisions aving only .drill feed indicia.

In Witness whereof, I have hereuntoL sub- 4, scribed my name.

DAVID C. KLAUSMEYER. 

